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The α-Helical Antibacterial Peptides Derived from Mastoparan with Broad-Spectrum Activity against Multidrug-Resistant

Jie Jing1,2, Chunlan Zeng2, Long Tian2

  • 1School of Pharmacy, Qingdao University, Qingdao 266071, China.

ACS Infectious Diseases
|April 18, 2025
PubMed

Insights

New antimicrobial peptides combat multidrug-resistant bacteria. MP9-10 shows potent activity against resistant strains with low toxicity, offering a promising treatment for infections.

Area of Science:

  • Microbiology
  • Biochemistry
  • Pharmacology

Background:

  • Antibiotic resistance is a growing global health threat.
  • Antimicrobial peptides (AMPs) are emerging as a potential alternative to conventional antibiotics.
  • The need for novel therapeutic agents against multidrug-resistant (MDR) bacteria is critical.

Purpose of the Study:

  • To design and synthesize novel antimicrobial peptides derived from MP9.
  • To evaluate the efficacy and safety of these novel peptides against multidrug-resistant bacteria.
  • To elucidate the mechanism of action of the most promising peptide candidate.

Main Methods:

  • Peptide design through amino acid substitution (tryptophan for alanine) and rearrangement.
  • Synthesis and characterization of novel peptide derivatives.
  • In vitro assessment of antibacterial activity, cytotoxicity, and hemolysis.
  • In vivo efficacy studies in a mouse infection model.

Main Results:

  • MP9-10 exhibited superior activity against multidrug-resistant bacteria compared to other derivatives.
  • MP9-10 demonstrated the lowest cytotoxicity and hemolysis, indicating a favorable safety profile.
  • Membrane disruption was identified as the primary mechanism of bacterial killing by MP9-10.
  • MP9-10 effectively treated Staphylococcus aureus infections in a mouse model.

Conclusions:

  • MP9-10 is a potent antimicrobial peptide with broad-spectrum activity against multidrug-resistant bacteria.
  • MP9-10 possesses a favorable safety profile, with low cytotoxicity and hemolysis.
  • The membrane disruption mechanism contributes to MP9-10's efficacy.
  • MP9-10 represents a promising therapeutic candidate for treating multidrug-resistant bacterial infections.
Keywords:
antibacterial peptidemastoparanmembrane permeabilitymultidrug-resistant bacteria

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